TALENT-NEXT-JAVA-QUIZ1

1) Which of the following option leads to the portability and security of Java?

• Bytecode is executed by JVM

• The applet makes the Java code secure and portable

• Use of exception handling

• Dynamic binding between objects

public class MyFirst { public static void main(String[] args) { MyFirst obj = new MyFirst(n);

}

static int a = 10;

static int n;

int b = 5;

int c;

public MyFirst(int m)

{

System.out.println(a + ", " + b + ", " + c + ", " + n + ", " + m);

} // Instance Block

{ b = 30; n = 20;

} // Static Block

static

{ a = 60;

}

}

• 10, 5, 0, 20, 0

• 10, 30, 20

• 60, 5, 0, 20

• 60, 30, 0, 20, 0

_____ is used to find and fix bugs in the Java programs.

• JVM

• JRE

• JDK

• JDB

Evaluate the following Java expression, if x=3, y=5, and z=10:

++z + y - y + z + x++

• 24

• 23

• 20

• 25

tell the output

public class Test {

public static void main(String[] args) {

int count = 1;

while (count <= 15)

{

System.out.println(count % 2 == 1 ? "***" : "+++++");

++count;

} // end while

} // end main

}

• 15 times ***

• 15 times +++++

• 8 times *** and 7 times +++++

• Both will print only once

Which of the following for loop declaration is not valid?

• for ( int i = 99; i >= 0; i / 9 )

• for ( int i = 7; i <= 77; i += 7 )

• for ( int i = 20; i >= 2; - -i )

• for ( int i = 2; i <= 20; i = 2* i )

Which method of the Class.class is used to determine the name of a class represented by the class object as a String?

• getClass()

• intern()

• getName()

• toString()

Which package contains the Random class?

• java.util package

• java.lang package

• java.awt package

• java.io package

What do you mean by nameless objects?

• An object created by using the new keyword.

• An object of a superclass created in the subclass. .

• An object without having any name but having a reference.

• An object that has no reference

Which option is false about the final keyword?

• A final method cannot be overridden in its subclasses.

• A final class cannot be extended.

• A final class cannot extend other classes.

• A final method can be inherited.